Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 777 842
2) Placement test : grammar for beginners (anonyme) 5 990 711
3) A/AN (webmaster) 5 364 577
4) Auxiliary BE (webmaster) 3 224 000
5) Present continuous (webmaster) 2 998 881
6) Present simple (webmaster) 2 913 594
7) Present simple (webmaster) 2 597 236
8) Present continuous (webmaster) 2 433 892
9) Adjectives (webmaster) 2 093 408
10) A/an (anonyme) 2 015 055
11) Present perfect simple (webmaster) 1 643 017
12) Preterite (webmaster) 1 627 658
13) Vocabulary - Placement test (bridg) 1 619 080
14) Preterite (webmaster) 1 447 154
15) Short placement test (webmaster) 1 443 440
16) To be (bridg) 1 406 070
17) What time is it? (webmaster) 1 349 198
18) Present perfect (webmaster) 1 345 743
19) The alphabet in English (webmaster) 1 320 913
20) Adjectives (anonyme) 1 215 722
21) What time is it? (webmaster) 1 208 149
22) Numbers (webmaster) 1 188 477
23) 'A' ou 'An' (anonyme) 1 175 301
24) Two presents: present continuous, present simple (webmaster) 1 149 170
25) To be (bridg) 1 145 417
26) Comparatives / Superlatives (webmaster) 1 103 751
27) Numbers (webmaster) 1 070 658
28) CAN / MUST (webmaster) 1 058 499
29) THE/ A / AN / nothing (webmaster) 1 033 483
30) Comparatives (webmaster) 1 007 095
31) Family life (bridg) 1 000 686
32) Numbers > 100 (webmaster) 986 236
33) Future (going to/will/present continuous) (anonyme) 963 850
34) Plural (webmaster) 955 649
35) Superlatives (webmaster) 875 143
36) Adjectives (anonyme) 874 686
37) Simple present (bridg) 853 866
38) Spelled words N°1 (bridg) 850 050
39) Placement test beginners: Check your spelling (anonyme) 830 024
40) Introducing oneself (webmaster) 827 119
41) Adverbs of frequency (anonyme) 817 206
42) Family (bridg) 784 669
43) General test-End of high school / Beginning of university (webmaster) 782 741
44) Present simple (anonyme) 780 150
45) Frequency adverbs (webmaster) 777 700
46) Present BE + Ving (bridg) 765 007
47) Genitive (webmaster) 723 579
48) Passive form (anonyme) 721 371
49) Family tree (anonyme) 719 310
50) Preterite: simple or continuous? (webmaster) 716 534
51) Placement test (beginners) (lili73) 700 933
52) Past simple or present perfect (anonyme) 693 788
53) Future (webmaster) 675 860
54) 2 Preterites (webmaster) 661 944
55) Present perfect simple (bridg) 660 774
56) Preterite (webmaster) 620 313
57) List of 200 irregular verbs and audio (bridg) 615 969
58) Modals (webmaster) 612 648
59) Spelled words N°2 (bridg) 609 102
60) Height (webmaster) 606 268
61) Modals (webmaster) 605 253
62) Articles a / an / the (anonyme) 596 758
63) Plural forms (bridg) 577 379
64) Nationalities (webmaster) 574 173
65) Past continuous / Past simple (anonyme) 566 097
66) Irregular plurals (bridg) 553 547
67) Two presents: simple and continuous (webmaster) 549 523
68) Preterite (bridg) 548 918
69) Superlatives (frapedur) 538 554
70) Vocabulary: greeting people (here4u) 536 461
71) Give your opinion (bridg) 531 870
72) Adverbs of Frequency (bridg) 516 910
73) Present simple or continuous (anonyme) 510 794
74) Present perfect / preterite ? (anonyme) 509 279
75) Possessive case (anonyme) 480 599
76) Countries & nationalities (bridg) 473 376
77) 'The' or nothing? (webmaster) 471 197
78) Past tenses (bridg) 470 720
79) Introducing oneself (easy) (webmaster) 470 684
80) Passive voice (webmaster) 463 309
81) Present Simple vs. Past Simple (anonyme) 456 928
82) Questions : how to ask them (anonyme) 448 296
83) General Test II / End of high school / Beginning of universi (webmaster) 446 128
84) IN, ON, AT or TO? (webmaster) 445 036
85) Relative pronouns (webmaster) 444 310
86) Comparative of superiority (anonyme) 438 496
87) How to pronounce the final -ED? (past simple) (webmaster) 437 583
88) Relative clauses (webmaster) 423 199
89) Sounds: [h] (webmaster) 419 475
90) Comparative (anonyme) 413 540
91) A/an/Ø (bridg) 398 722
92) Past simple (anonyme) 396 897
93) Future simple (anonyme) 396 285
94) This / That / These / Those (webmaster) 392 488
95) Conditional (webmaster) 391 585
96) Passive voice (anonyme) 390 429
97) Comparing (webmaster) 387 966
98) Can / could/ may/ might (woodyrun) 379 404
99) Present perfect or past tense (anonyme) 377 271
100) Much, many, little and few (felin) 372 663
101) Personal pronouns (anonyme) 371 271
102) Preterite continuous (BE + -ING) (webmaster) 369 096
103) Some, any, no, enough, too/too much/too many (webmaster) 368 055
104) Genitive case (bridg) 367 970
105) Confusing words - Placement test (bridg) 364 509
106) Irregular verbs (webmaster) 363 515
107) Numbers from 1 to 10 (anonyme) 361 484
108) Past perfect simple, past perfect continuous (anonyme) 360 868
109) Present continuous or present simple (webmaster) 359 518
110) Present perfect or preterite? (anonyme) 356 628
111) Simple Past : regular verbs (anonyme) 352 890
112) Comparative Adjectives (bridg) 352 166
113) Who, Whom, Which, or Whose? (anonyme) 348 740
114) Past simple (video) (anonyme) 348 300
115) Past simple or past continuous (anonyme) 342 446
116) While / When (anonyme) 338 575
117) What time is it? (webmaster) 337 782
118) Modals (tinou) 336 491
119) Modal: may/might (anonyme) 334 157
120) Cardinal and ordinal numbers (anonyme) 328 677
121) The superlative (anonyme) 325 213
122) Possessive adjectives and pronouns (woodyrun) 324 101
123) How to talk about the weather (lili73) 320 875
124) Since and for (anonyme) 318 722
125) Flags (webmaster) 317 513
126) Irregular verbs (bridg) 315 933
127) Prepositions - in, on, at (anonyme) 314 066
128) Pronouns (woodyrun) 313 554
129) Tenses (anonyme) 311 849
130) Placement test 3 (webmaster) 310 381
131) Order of adjectives (webmaster) 306 526
132) Could/Couldn't (laure95) 305 766
133) Comparative (anonyme) 304 462
134) Adjectives and prepositions (anonyme) 303 989
135) Agreement Tags (webmaster) 303 981
136) Asking questions (webmaster) 303 039
137) Present perfect OR simple past? (bridg) 298 307
138) Questions in the past tense (anonyme) 297 473
139) Superlative Adjectives (bridg) 295 742
140) Uncountable nouns (webmaster) 295 572
141) Object pronouns (bridg) 294 860
142) Placement test 1 (anonyme) 292 710
143) Present simple (anonyme) 291 144
144) Passive form (anonyme) 290 942
145) Prefer/rather (bridg) 289 309
146) Can/Must/Should (laure95) 289 143
147) Past perfect (lili73) 287 886
148) Must or Have to? (woodyrun) 287 390
149) The/an/nothing (bridg) 285 177
150) To be (anonyme) 283 452
151) Can and can't (laure95) 281 361
152) Vocabulary: asking and answering (here4u) 280 440
153) Modal verbs (bridg) 277 215
154) Some / Any / no... (bridg) 270 398
155) Days of the week (bridg) 269 096
156) So / neither (anonyme) 264 302
157) Past simple (video) (anonyme) 263 665
158) Used to (bridg) 260 340
159) Present continuous (chnawa) 259 870
160) Should / must (anonyme) 259 504
161) Past tense (anonyme) 259 258
162) Vocabulary: on the phone (here4u) 258 722
163) Find out a quantity (webmaster) 258 522
164) Superlative + and adjective (anonyme) 257 124
165) Articles : a / an / the / Ø (anonyme) 256 736
166) Comparative and superlative (anonyme) 255 101
167) Numbers 1/100 (anonyme) 253 609
168) Modal can (video) (anonyme) 252 933
169) Relatives pronouns (who, which, that...) (anonyme) 247 837
170) Comparatives (anonyme) 247 793
171) Vocabulary: at the restaurant (here4u) 245 650
172) A few, a little, few, little (anonyme) 245 213
173) Would rather / would prefer to (anonyme) 244 216
174) Present continuous and the Going to form (anonyme) 242 517
175) Should/ have to/ must (anonyme) 239 870
176) Have something done (anonyme) 239 772
177) The past (webmaster) 237 765
178) Future continuous and future perfect. (felin) 237 587
179) Used to/would (woodyrun) 237 542
180) How to ask a question in English (bridg) 235 352
181) I wish, if only (felin) 234 050
182) Pluperfect (webmaster) 233 849
183) Countable or Uncountable? (webmaster) 233 103
184) Some / any (younes91) 232 632
185) Should / shouldn't (anonyme) 231 410
186) Present simple or continuous (bridg) 230 785
187) Adjectives - ing and ed (felin) 228 923
188) Hypothesis (webmaster) 228 078
189) Auxiliary BE (anonyme) 226 399
190) Articles a/an/the/0 (bridg) 226 255
191) Article The or nothing (anonyme) 225 888
192) Present perfect with Ever - never - (anonyme) 225 489
193) Must or mustn't (laure95) 225 396
194) Present continuous OR Present simple? (bridg) 225 327
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 222 762
196) To / in order to / so as to / so that (irish21) 219 978
197) Present perfect (bridg) 219 421
198) Comparison (komiks) 218 312
199) What time is it ? (anonyme) 217 625
200) Indirect speech (bridg) 216 485
