Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 778 811
2) Placement test : grammar for beginners (anonyme) 5 992 948
3) A/AN (webmaster) 5 365 643
4) Auxiliary BE (webmaster) 3 224 501
5) Present continuous (webmaster) 2 999 470
6) Present simple (webmaster) 2 915 639
7) Present simple (webmaster) 2 597 807
8) Present continuous (webmaster) 2 435 183
9) Adjectives (webmaster) 2 093 751
10) A/an (anonyme) 2 015 600
11) Present perfect simple (webmaster) 1 644 095
12) Preterite (webmaster) 1 629 020
13) Vocabulary - Placement test (bridg) 1 619 351
14) Preterite (webmaster) 1 448 132
15) Short placement test (webmaster) 1 443 681
16) To be (bridg) 1 406 415
17) What time is it? (webmaster) 1 349 546
18) Present perfect (webmaster) 1 346 632
19) The alphabet in English (webmaster) 1 321 238
20) Adjectives (anonyme) 1 216 089
21) What time is it? (webmaster) 1 208 788
22) Numbers (webmaster) 1 188 641
23) 'A' ou 'An' (anonyme) 1 175 745
24) Two presents: present continuous, present simple (webmaster) 1 149 599
25) To be (bridg) 1 145 684
26) Comparatives / Superlatives (webmaster) 1 104 840
27) Numbers (webmaster) 1 070 959
28) CAN / MUST (webmaster) 1 058 787
29) THE/ A / AN / nothing (webmaster) 1 033 933
30) Comparatives (webmaster) 1 007 321
31) Family life (bridg) 1 000 956
32) Numbers > 100 (webmaster) 986 422
33) Future (going to/will/present continuous) (anonyme) 964 258
34) Plural (webmaster) 955 864
35) Superlatives (webmaster) 875 386
36) Adjectives (anonyme) 874 926
37) Simple present (bridg) 854 099
38) Spelled words N°1 (bridg) 850 274
39) Placement test beginners: Check your spelling (anonyme) 830 144
40) Introducing oneself (webmaster) 827 260
41) Adverbs of frequency (anonyme) 817 675
42) Family (bridg) 784 891
43) General test-End of high school / Beginning of university (webmaster) 782 956
44) Present simple (anonyme) 781 046
45) Frequency adverbs (webmaster) 777 853
46) Present BE + Ving (bridg) 765 235
47) Genitive (webmaster) 723 756
48) Passive form (anonyme) 723 066
49) Family tree (anonyme) 719 497
50) Preterite: simple or continuous? (webmaster) 716 897
51) Placement test (beginners) (lili73) 701 235
52) Past simple or present perfect (anonyme) 694 416
53) Future (webmaster) 676 041
54) 2 Preterites (webmaster) 662 187
55) Present perfect simple (bridg) 661 558
56) Preterite (webmaster) 620 614
57) List of 200 irregular verbs and audio (bridg) 616 191
58) Modals (webmaster) 612 776
59) Spelled words N°2 (bridg) 609 277
60) Height (webmaster) 606 372
61) Modals (webmaster) 605 716
62) Articles a / an / the (anonyme) 596 760
63) Plural forms (bridg) 577 581
64) Nationalities (webmaster) 574 342
65) Past continuous / Past simple (anonyme) 566 700
66) Irregular plurals (bridg) 553 720
67) Two presents: simple and continuous (webmaster) 549 743
68) Preterite (bridg) 549 181
69) Superlatives (frapedur) 539 183
70) Vocabulary: greeting people (here4u) 536 479
71) Give your opinion (bridg) 532 069
72) Adverbs of Frequency (bridg) 517 015
73) Present simple or continuous (anonyme) 511 483
74) Present perfect / preterite ? (anonyme) 509 864
75) Possessive case (anonyme) 480 755
76) Countries & nationalities (bridg) 473 580
77) 'The' or nothing? (webmaster) 471 286
78) Past tenses (bridg) 470 982
79) Introducing oneself (easy) (webmaster) 470 770
80) Passive voice (webmaster) 463 593
81) Present Simple vs. Past Simple (anonyme) 457 528
82) Questions : how to ask them (anonyme) 448 509
83) General Test II / End of high school / Beginning of universi (webmaster) 446 207
84) IN, ON, AT or TO? (webmaster) 445 371
85) Relative pronouns (webmaster) 444 634
86) Comparative of superiority (anonyme) 438 823
87) How to pronounce the final -ED? (past simple) (webmaster) 438 010
88) Relative clauses (webmaster) 423 387
89) Sounds: [h] (webmaster) 419 562
90) Comparative (anonyme) 413 795
91) A/an/Ø (bridg) 398 903
92) Past simple (anonyme) 397 557
93) Future simple (anonyme) 396 485
94) This / That / These / Those (webmaster) 392 585
95) Conditional (webmaster) 391 748
96) Passive voice (anonyme) 390 746
97) Comparing (webmaster) 388 073
98) Can / could/ may/ might (woodyrun) 379 561
99) Present perfect or past tense (anonyme) 377 583
100) Much, many, little and few (felin) 372 941
101) Personal pronouns (anonyme) 371 376
102) Preterite continuous (BE + -ING) (webmaster) 369 415
103) Some, any, no, enough, too/too much/too many (webmaster) 368 148
104) Genitive case (bridg) 368 131
105) Confusing words - Placement test (bridg) 364 555
106) Irregular verbs (webmaster) 363 661
107) Numbers from 1 to 10 (anonyme) 361 561
108) Past perfect simple, past perfect continuous (anonyme) 360 936
109) Present continuous or present simple (webmaster) 359 621
110) Present perfect or preterite? (anonyme) 357 018
111) Simple Past : regular verbs (anonyme) 353 201
112) Comparative Adjectives (bridg) 352 273
113) Who, Whom, Which, or Whose? (anonyme) 348 862
114) Past simple (video) (anonyme) 348 517
115) Past simple or past continuous (anonyme) 342 944
116) While / When (anonyme) 338 897
117) What time is it? (webmaster) 337 998
118) Modals (tinou) 336 603
119) Modal: may/might (anonyme) 334 240
120) Cardinal and ordinal numbers (anonyme) 328 769
121) The superlative (anonyme) 325 665
122) Possessive adjectives and pronouns (woodyrun) 324 251
123) How to talk about the weather (lili73) 320 890
124) Since and for (anonyme) 318 909
125) Flags (webmaster) 317 622
126) Irregular verbs (bridg) 316 070
127) Prepositions - in, on, at (anonyme) 314 149
128) Pronouns (woodyrun) 313 747
129) Tenses (anonyme) 312 009
130) Placement test 3 (webmaster) 310 501
131) Order of adjectives (webmaster) 306 608
132) Could/Couldn't (laure95) 305 909
133) Comparative (anonyme) 304 677
134) Agreement Tags (webmaster) 304 077
135) Adjectives and prepositions (anonyme) 304 064
136) Asking questions (webmaster) 303 119
137) Present perfect OR simple past? (bridg) 298 400
138) Questions in the past tense (anonyme) 297 590
139) Superlative Adjectives (bridg) 295 852
140) Uncountable nouns (webmaster) 295 689
141) Object pronouns (bridg) 295 038
142) Placement test 1 (anonyme) 292 827
143) Passive form (anonyme) 291 447
144) Present simple (anonyme) 291 353
145) Prefer/rather (bridg) 289 443
146) Can/Must/Should (laure95) 289 443
147) Past perfect (lili73) 288 354
148) Must or Have to? (woodyrun) 287 587
149) The/an/nothing (bridg) 285 301
150) To be (anonyme) 283 501
151) Can and can't (laure95) 281 673
152) Vocabulary: asking and answering (here4u) 280 444
153) Modal verbs (bridg) 277 314
154) Some / Any / no... (bridg) 270 548
155) Days of the week (bridg) 269 110
156) So / neither (anonyme) 264 382
157) Past simple (video) (anonyme) 263 755
158) Used to (bridg) 260 373
159) Present continuous (chnawa) 260 274
160) Should / must (anonyme) 259 670
161) Past tense (anonyme) 259 349
162) Vocabulary: on the phone (here4u) 258 736
163) Find out a quantity (webmaster) 258 570
164) Superlative + and adjective (anonyme) 257 249
165) Articles : a / an / the / Ø (anonyme) 257 063
166) Comparative and superlative (anonyme) 255 365
167) Numbers 1/100 (anonyme) 253 664
168) Modal can (video) (anonyme) 253 014
169) Comparatives (anonyme) 248 459
170) Relatives pronouns (who, which, that...) (anonyme) 247 849
171) Vocabulary: at the restaurant (here4u) 245 658
172) A few, a little, few, little (anonyme) 245 404
173) Would rather / would prefer to (anonyme) 244 269
174) Present continuous and the Going to form (anonyme) 242 636
175) Should/ have to/ must (anonyme) 240 009
176) Have something done (anonyme) 239 846
177) The past (webmaster) 237 809
178) Used to/would (woodyrun) 237 667
179) Future continuous and future perfect. (felin) 237 621
180) How to ask a question in English (bridg) 235 454
181) I wish, if only (felin) 234 088
182) Pluperfect (webmaster) 233 959
183) Countable or Uncountable? (webmaster) 233 156
184) Some / any (younes91) 232 888
185) Should / shouldn't (anonyme) 231 541
186) Present simple or continuous (bridg) 230 799
187) Adjectives - ing and ed (felin) 229 095
188) Hypothesis (webmaster) 228 139
189) Auxiliary BE (anonyme) 226 447
190) Articles a/an/the/0 (bridg) 226 292
191) Article The or nothing (anonyme) 225 953
192) Must or mustn't (laure95) 225 651
193) Present perfect with Ever - never - (anonyme) 225 558
194) Present continuous OR Present simple? (bridg) 225 439
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 222 829
196) To / in order to / so as to / so that (irish21) 220 216
197) Present perfect (bridg) 219 503
198) Comparison (komiks) 218 826
199) What time is it ? (anonyme) 217 650
200) Indirect speech (bridg) 216 638
