Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 779 640
2) Placement test : grammar for beginners (anonyme) 5 994 171
3) A/AN (webmaster) 5 366 726
4) Auxiliary BE (webmaster) 3 225 018
5) Present continuous (webmaster) 3 000 070
6) Present simple (webmaster) 2 916 932
7) Present simple (webmaster) 2 598 352
8) Present continuous (webmaster) 2 435 905
9) Adjectives (webmaster) 2 094 072
10) A/an (anonyme) 2 016 165
11) Present perfect simple (webmaster) 1 644 824
12) Preterite (webmaster) 1 629 786
13) Vocabulary - Placement test (bridg) 1 619 554
14) Preterite (webmaster) 1 448 703
15) Short placement test (webmaster) 1 443 925
16) To be (bridg) 1 406 722
17) What time is it? (webmaster) 1 349 823
18) Present perfect (webmaster) 1 347 238
19) The alphabet in English (webmaster) 1 321 552
20) Adjectives (anonyme) 1 216 378
21) What time is it? (webmaster) 1 209 215
22) Numbers (webmaster) 1 188 845
23) 'A' ou 'An' (anonyme) 1 176 179
24) Two presents: present continuous, present simple (webmaster) 1 149 907
25) To be (bridg) 1 145 929
26) Comparatives / Superlatives (webmaster) 1 105 368
27) Numbers (webmaster) 1 071 142
28) CAN / MUST (webmaster) 1 058 967
29) THE/ A / AN / nothing (webmaster) 1 034 313
30) Comparatives (webmaster) 1 007 542
31) Family life (bridg) 1 001 219
32) Numbers > 100 (webmaster) 986 714
33) Future (going to/will/present continuous) (anonyme) 964 533
34) Plural (webmaster) 956 094
35) Superlatives (webmaster) 875 598
36) Adjectives (anonyme) 875 137
37) Simple present (bridg) 854 326
38) Spelled words N°1 (bridg) 850 488
39) Placement test beginners: Check your spelling (anonyme) 830 233
40) Introducing oneself (webmaster) 827 388
41) Adverbs of frequency (anonyme) 817 954
42) Family (bridg) 785 100
43) General test-End of high school / Beginning of university (webmaster) 783 079
44) Present simple (anonyme) 781 468
45) Frequency adverbs (webmaster) 778 020
46) Present BE + Ving (bridg) 765 491
47) Genitive (webmaster) 723 910
48) Passive form (anonyme) 723 896
49) Family tree (anonyme) 719 675
50) Preterite: simple or continuous? (webmaster) 717 140
51) Placement test (beginners) (lili73) 701 465
52) Past simple or present perfect (anonyme) 694 708
53) Future (webmaster) 676 150
54) 2 Preterites (webmaster) 662 411
55) Present perfect simple (bridg) 661 994
56) Preterite (webmaster) 620 819
57) List of 200 irregular verbs and audio (bridg) 616 357
58) Modals (webmaster) 612 949
59) Spelled words N°2 (bridg) 609 444
60) Height (webmaster) 606 515
61) Modals (webmaster) 606 087
62) Articles a / an / the (anonyme) 596 766
63) Plural forms (bridg) 577 746
64) Nationalities (webmaster) 574 469
65) Past continuous / Past simple (anonyme) 567 033
66) Irregular plurals (bridg) 553 886
67) Two presents: simple and continuous (webmaster) 549 871
68) Preterite (bridg) 549 278
69) Superlatives (frapedur) 539 558
70) Vocabulary: greeting people (here4u) 536 500
71) Give your opinion (bridg) 532 215
72) Adverbs of Frequency (bridg) 517 152
73) Present simple or continuous (anonyme) 511 727
74) Present perfect / preterite ? (anonyme) 510 132
75) Possessive case (anonyme) 480 866
76) Countries & nationalities (bridg) 473 722
77) 'The' or nothing? (webmaster) 471 380
78) Past tenses (bridg) 471 185
79) Introducing oneself (easy) (webmaster) 470 862
80) Passive voice (webmaster) 463 789
81) Present Simple vs. Past Simple (anonyme) 457 936
82) Questions : how to ask them (anonyme) 448 621
83) General Test II / End of high school / Beginning of universi (webmaster) 446 273
84) IN, ON, AT or TO? (webmaster) 445 549
85) Relative pronouns (webmaster) 444 752
86) Comparative of superiority (anonyme) 439 013
87) How to pronounce the final -ED? (past simple) (webmaster) 438 203
88) Relative clauses (webmaster) 423 544
89) Sounds: [h] (webmaster) 419 630
90) Comparative (anonyme) 414 005
91) A/an/Ø (bridg) 399 018
92) Past simple (anonyme) 397 934
93) Future simple (anonyme) 396 637
94) This / That / These / Those (webmaster) 392 698
95) Conditional (webmaster) 391 884
96) Passive voice (anonyme) 390 872
97) Comparing (webmaster) 388 156
98) Can / could/ may/ might (woodyrun) 379 844
99) Present perfect or past tense (anonyme) 377 736
100) Much, many, little and few (felin) 373 117
101) Personal pronouns (anonyme) 371 406
102) Preterite continuous (BE + -ING) (webmaster) 369 610
103) Some, any, no, enough, too/too much/too many (webmaster) 368 285
104) Genitive case (bridg) 368 276
105) Confusing words - Placement test (bridg) 364 603
106) Irregular verbs (webmaster) 363 748
107) Numbers from 1 to 10 (anonyme) 361 643
108) Past perfect simple, past perfect continuous (anonyme) 360 987
109) Present continuous or present simple (webmaster) 359 710
110) Present perfect or preterite? (anonyme) 357 186
111) Simple Past : regular verbs (anonyme) 353 385
112) Comparative Adjectives (bridg) 352 348
113) Who, Whom, Which, or Whose? (anonyme) 348 951
114) Past simple (video) (anonyme) 348 634
115) Past simple or past continuous (anonyme) 343 167
116) While / When (anonyme) 339 229
117) What time is it? (webmaster) 338 118
118) Modals (tinou) 336 676
119) Modal: may/might (anonyme) 334 313
120) Cardinal and ordinal numbers (anonyme) 328 855
121) The superlative (anonyme) 325 898
122) Possessive adjectives and pronouns (woodyrun) 324 442
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) 316 141
127) Prepositions - in, on, at (anonyme) 314 205
128) Pronouns (woodyrun) 313 878
129) Tenses (anonyme) 312 121
130) Placement test 3 (webmaster) 310 617
131) Order of adjectives (webmaster) 306 678
132) Could/Couldn't (laure95) 306 009
133) Comparative (anonyme) 304 801
134) Agreement Tags (webmaster) 304 154
135) Adjectives and prepositions (anonyme) 304 117
136) Asking questions (webmaster) 303 254
137) Present perfect OR simple past? (bridg) 298 491
138) Questions in the past tense (anonyme) 297 682
139) Superlative Adjectives (bridg) 295 911
140) Uncountable nouns (webmaster) 295 850
141) Object pronouns (bridg) 295 137
142) Placement test 1 (anonyme) 292 909
143) Passive form (anonyme) 291 626
144) Present simple (anonyme) 291 451
145) Can/Must/Should (laure95) 289 706
146) Prefer/rather (bridg) 289 563
147) Past perfect (lili73) 288 539
148) Must or Have to? (woodyrun) 287 696
149) The/an/nothing (bridg) 285 371
150) To be (anonyme) 283 526
151) Can and can't (laure95) 281 803
152) Vocabulary: asking and answering (here4u) 280 456
153) Modal verbs (bridg) 277 349
154) Some / Any / no... (bridg) 273 168
155) Days of the week (bridg) 269 118
156) So / neither (anonyme) 264 402
157) Past simple (video) (anonyme) 263 808
158) Present continuous (chnawa) 260 545
159) Used to (bridg) 260 431
160) Should / must (anonyme) 259 778
161) Past tense (anonyme) 259 411
162) Vocabulary: on the phone (here4u) 258 756
163) Find out a quantity (webmaster) 258 609
164) Superlative + and adjective (anonyme) 257 341
165) Articles : a / an / the / Ø (anonyme) 257 130
166) Comparative and superlative (anonyme) 255 578
167) Numbers 1/100 (anonyme) 253 704
168) Modal can (video) (anonyme) 253 066
169) Comparatives (anonyme) 248 752
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) 245 560
173) Would rather / would prefer to (anonyme) 244 397
174) Present continuous and the Going to form (anonyme) 242 745
175) Should/ have to/ must (anonyme) 240 098
176) Have something done (anonyme) 239 889
177) The past (webmaster) 237 877
178) Used to/would (woodyrun) 237 693
179) Future continuous and future perfect. (felin) 237 665
180) How to ask a question in English (bridg) 235 554
181) I wish, if only (felin) 234 108
182) Pluperfect (webmaster) 234 021
183) Countable or Uncountable? (webmaster) 233 249
184) Some / any (younes91) 232 999
185) Should / shouldn't (anonyme) 231 601
186) Present simple or continuous (bridg) 230 804
187) Adjectives - ing and ed (felin) 229 163
188) Hypothesis (webmaster) 228 264
189) Auxiliary BE (anonyme) 226 482
190) Articles a/an/the/0 (bridg) 226 332
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) 225 534
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 222 862
196) To / in order to / so as to / so that (irish21) 220 442
197) Present perfect (bridg) 219 540
198) Comparison (komiks) 219 097
199) What time is it ? (anonyme) 217 698
200) Indirect speech (bridg) 216 746
