Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 779 628
2) Placement test : grammar for beginners (anonyme) 5 994 129
3) A/AN (webmaster) 5 366 628
4) Auxiliary BE (webmaster) 3 224 974
5) Present continuous (webmaster) 3 000 008
6) Present simple (webmaster) 2 916 898
7) Present simple (webmaster) 2 598 306
8) Present continuous (webmaster) 2 435 881
9) Adjectives (webmaster) 2 094 040
10) A/an (anonyme) 2 016 155
11) Present perfect simple (webmaster) 1 644 810
12) Preterite (webmaster) 1 629 771
13) Vocabulary - Placement test (bridg) 1 619 551
14) Preterite (webmaster) 1 448 684
15) Short placement test (webmaster) 1 443 904
16) To be (bridg) 1 406 712
17) What time is it? (webmaster) 1 349 801
18) Present perfect (webmaster) 1 347 212
19) The alphabet in English (webmaster) 1 321 543
20) Adjectives (anonyme) 1 216 372
21) What time is it? (webmaster) 1 209 208
22) Numbers (webmaster) 1 188 818
23) 'A' ou 'An' (anonyme) 1 176 173
24) Two presents: present continuous, present simple (webmaster) 1 149 892
25) To be (bridg) 1 145 925
26) Comparatives / Superlatives (webmaster) 1 105 351
27) Numbers (webmaster) 1 071 139
28) CAN / MUST (webmaster) 1 058 959
29) THE/ A / AN / nothing (webmaster) 1 034 287
30) Comparatives (webmaster) 1 007 520
31) Family life (bridg) 1 001 211
32) Numbers > 100 (webmaster) 986 694
33) Future (going to/will/present continuous) (anonyme) 964 527
34) Plural (webmaster) 956 087
35) Superlatives (webmaster) 875 583
36) Adjectives (anonyme) 875 133
37) Simple present (bridg) 854 321
38) Spelled words N°1 (bridg) 850 483
39) Placement test beginners: Check your spelling (anonyme) 830 233
40) Introducing oneself (webmaster) 827 386
41) Adverbs of frequency (anonyme) 817 946
42) Family (bridg) 785 096
43) General test-End of high school / Beginning of university (webmaster) 783 074
44) Present simple (anonyme) 781 452
45) Frequency adverbs (webmaster) 778 009
46) Present BE + Ving (bridg) 765 486
47) Genitive (webmaster) 723 903
48) Passive form (anonyme) 723 843
49) Family tree (anonyme) 719 671
50) Preterite: simple or continuous? (webmaster) 717 131
51) Placement test (beginners) (lili73) 701 463
52) Past simple or present perfect (anonyme) 694 704
53) Future (webmaster) 676 143
54) 2 Preterites (webmaster) 662 396
55) Present perfect simple (bridg) 661 987
56) Preterite (webmaster) 620 816
57) List of 200 irregular verbs and audio (bridg) 616 350
58) Modals (webmaster) 612 932
59) Spelled words N°2 (bridg) 609 439
60) Height (webmaster) 606 492
61) Modals (webmaster) 606 068
62) Articles a / an / the (anonyme) 596 766
63) Plural forms (bridg) 577 738
64) Nationalities (webmaster) 574 468
65) Past continuous / Past simple (anonyme) 567 028
66) Irregular plurals (bridg) 553 881
67) Two presents: simple and continuous (webmaster) 549 867
68) Preterite (bridg) 549 276
69) Superlatives (frapedur) 539 542
70) Vocabulary: greeting people (here4u) 536 500
71) Give your opinion (bridg) 532 214
72) Adverbs of Frequency (bridg) 517 149
73) Present simple or continuous (anonyme) 511 719
74) Present perfect / preterite ? (anonyme) 510 120
75) Possessive case (anonyme) 480 860
76) Countries & nationalities (bridg) 473 721
77) 'The' or nothing? (webmaster) 471 377
78) Past tenses (bridg) 471 172
79) Introducing oneself (easy) (webmaster) 470 861
80) Passive voice (webmaster) 463 776
81) Present Simple vs. Past Simple (anonyme) 457 926
82) Questions : how to ask them (anonyme) 448 615
83) General Test II / End of high school / Beginning of universi (webmaster) 446 270
84) IN, ON, AT or TO? (webmaster) 445 545
85) Relative pronouns (webmaster) 444 747
86) Comparative of superiority (anonyme) 439 009
87) How to pronounce the final -ED? (past simple) (webmaster) 438 199
88) Relative clauses (webmaster) 423 531
89) Sounds: [h] (webmaster) 419 629
90) Comparative (anonyme) 414 002
91) A/an/Ø (bridg) 399 016
92) Past simple (anonyme) 397 925
93) Future simple (anonyme) 396 634
94) This / That / These / Those (webmaster) 392 696
95) Conditional (webmaster) 391 882
96) Passive voice (anonyme) 390 872
97) Comparing (webmaster) 388 155
98) Can / could/ may/ might (woodyrun) 379 839
99) Present perfect or past tense (anonyme) 377 736
100) Much, many, little and few (felin) 373 113
101) Personal pronouns (anonyme) 371 405
102) Preterite continuous (BE + -ING) (webmaster) 369 607
103) Genitive case (bridg) 368 273
104) Some, any, no, enough, too/too much/too many (webmaster) 368 272
105) Confusing words - Placement test (bridg) 364 601
106) Irregular verbs (webmaster) 363 746
107) Numbers from 1 to 10 (anonyme) 361 642
108) Past perfect simple, past perfect continuous (anonyme) 360 981
109) Present continuous or present simple (webmaster) 359 704
110) Present perfect or preterite? (anonyme) 357 181
111) Simple Past : regular verbs (anonyme) 353 383
112) Comparative Adjectives (bridg) 352 347
113) Who, Whom, Which, or Whose? (anonyme) 348 950
114) Past simple (video) (anonyme) 348 632
115) Past simple or past continuous (anonyme) 343 164
116) While / When (anonyme) 339 218
117) What time is it? (webmaster) 338 117
118) Modals (tinou) 336 676
119) Modal: may/might (anonyme) 334 313
120) Cardinal and ordinal numbers (anonyme) 328 852
121) The superlative (anonyme) 325 897
122) Possessive adjectives and pronouns (woodyrun) 324 441
123) How to talk about the weather (lili73) 320 908
124) Since and for (anonyme) 318 997
125) Flags (webmaster) 317 687
126) Irregular verbs (bridg) 316 138
127) Prepositions - in, on, at (anonyme) 314 200
128) Pronouns (woodyrun) 313 872
129) Tenses (anonyme) 312 117
130) Placement test 3 (webmaster) 310 610
131) Order of adjectives (webmaster) 306 677
132) Could/Couldn't (laure95) 306 007
133) Comparative (anonyme) 304 797
134) Agreement Tags (webmaster) 304 153
135) Adjectives and prepositions (anonyme) 304 117
136) Asking questions (webmaster) 303 239
137) Present perfect OR simple past? (bridg) 298 488
138) Questions in the past tense (anonyme) 297 674
139) Superlative Adjectives (bridg) 295 905
140) Uncountable nouns (webmaster) 295 835
141) Object pronouns (bridg) 295 137
142) Placement test 1 (anonyme) 292 909
143) Passive form (anonyme) 291 618
144) Present simple (anonyme) 291 449
145) Can/Must/Should (laure95) 289 701
146) Prefer/rather (bridg) 289 562
147) Past perfect (lili73) 288 536
148) Must or Have to? (woodyrun) 287 691
149) The/an/nothing (bridg) 285 368
150) To be (anonyme) 283 525
151) Can and can't (laure95) 281 801
152) Vocabulary: asking and answering (here4u) 280 456
153) Modal verbs (bridg) 277 349
154) Some / Any / no... (bridg) 273 138
155) Days of the week (bridg) 269 118
156) So / neither (anonyme) 264 401
157) Past simple (video) (anonyme) 263 807
158) Present continuous (chnawa) 260 528
159) Used to (bridg) 260 431
160) Should / must (anonyme) 259 776
161) Past tense (anonyme) 259 411
162) Vocabulary: on the phone (here4u) 258 755
163) Find out a quantity (webmaster) 258 607
164) Superlative + and adjective (anonyme) 257 341
165) Articles : a / an / the / Ø (anonyme) 257 129
166) Comparative and superlative (anonyme) 255 575
167) Numbers 1/100 (anonyme) 253 694
168) Modal can (video) (anonyme) 253 065
169) Comparatives (anonyme) 248 746
170) Relatives pronouns (who, which, that...) (anonyme) 247 849
171) Vocabulary: at the restaurant (here4u) 245 672
172) A few, a little, few, little (anonyme) 245 559
173) Would rather / would prefer to (anonyme) 244 385
174) Present continuous and the Going to form (anonyme) 242 742
175) Should/ have to/ must (anonyme) 240 092
176) Have something done (anonyme) 239 887
177) The past (webmaster) 237 877
178) Used to/would (woodyrun) 237 689
179) Future continuous and future perfect. (felin) 237 665
180) How to ask a question in English (bridg) 235 552
181) I wish, if only (felin) 234 108
182) Pluperfect (webmaster) 234 014
183) Countable or Uncountable? (webmaster) 233 245
184) Some / any (younes91) 232 993
185) Should / shouldn't (anonyme) 231 601
186) Present simple or continuous (bridg) 230 802
187) Adjectives - ing and ed (felin) 229 163
188) Hypothesis (webmaster) 228 254
189) Auxiliary BE (anonyme) 226 482
190) Articles a/an/the/0 (bridg) 226 331
191) Article The or nothing (anonyme) 226 017
192) Must or mustn't (laure95) 225 805
193) Present perfect with Ever - never - (anonyme) 225 643
194) Present continuous OR Present simple? (bridg) 225 532
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 222 861
196) To / in order to / so as to / so that (irish21) 220 439
197) Present perfect (bridg) 219 539
198) Comparison (komiks) 219 094
199) What time is it ? (anonyme) 217 698
200) Indirect speech (bridg) 216 745
